diff --git a/Zip.xcodeproj/project.pbxproj b/Zip.xcodeproj/project.pbxproj
index 6fa2a7d0e323f777a4c61ffc3af7f0411c98eb67..b4d17276fa69baf64f94caa7b4651efa9a04e2b5 100644
--- a/Zip.xcodeproj/project.pbxproj
+++ b/Zip.xcodeproj/project.pbxproj
@@ -692,6 +692,7 @@
 				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				SWIFT_INCLUDE_PATHS = "${SRCROOT}/Zip/minizip/**";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -717,6 +718,7 @@
 				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				SWIFT_INCLUDE_PATHS = "${SRCROOT}/Zip/minizip/**";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -742,6 +744,7 @@
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_INCLUDE_PATHS = "${SRCROOT}/Zip/minizip/**";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -766,6 +769,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_INCLUDE_PATHS = "${SRCROOT}/Zip/minizip/**";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};